According to the October 15, 2000 Watchtower, JW's are allowed to make their own decision concerning procedures/treatments involving the removal/return of their own blood if done within the course of a "current therapy". A "current therapy" has been interpreted as meaning within a single hospital stay but in actual practice these procedures are usually accomplished within the same day.
This is a big change from the policy that was in effect prior to the October 15, 2000 Watchtower. During this time it was forbidden for JW's to have blood that was removed from their body and even briefly stored to be put back into them. Today a JW can have any amount of their blood removed from their body, stored, treated and then transfused back into them several hours later. It is still forbidden to pre-donate one's blood and store it for several weeks prior to surgery.
This change has huge implications.
It is no longer true that having blood injected into the veins is the same as eating it, otherwise JW's are guilty of eating blood.
It is no longer true to say that JW's abstain from transfusions of whole blood, white cells, red cells, plasma or platelets because they accept any and all of these in autologous form so long as it is part of a "current therapy."
Since it can no longer be argued that injecting blood into the veins is the same as eating it or that injecting blood into the veins is NOT abstaining from blood, on what grounds are JW's forbidden from pre-donating their own blood for a future operation or from even taking a transfusion of donor blood?